JP2811079B2 - Electrostatic image developing carrier and method of manufacturing the same - Google Patents
Electrostatic image developing carrier and method of manufacturing the sameInfo
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- JP2811079B2 JP2811079B2 JP1079312A JP7931289A JP2811079B2 JP 2811079 B2 JP2811079 B2 JP 2811079B2 JP 1079312 A JP1079312 A JP 1079312A JP 7931289 A JP7931289 A JP 7931289A JP 2811079 B2 JP2811079 B2 JP 2811079B2
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- Prior art keywords
- resin
- particles
- carrier
- coating
- fine particles
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は静電像現像用キャリアに関し、特にその乾式
コーティング法及び該法による樹脂コーティドキャリア
に関する。Description: TECHNICAL FIELD The present invention relates to a carrier for developing an electrostatic image, and more particularly to a dry coating method and a resin-coated carrier by the method.
一般に、電子写真法においては、光導電性材料により
なる感光層を有する感光体に均一な静電荷を与えた後、
画像露光を行なうことにより感光体の表面に静電潜像を
形成し、この静電潜像を現像剤により現像してトナー画
像が形成される。得られたトナー画像は紙などの転写剤
に転写された後、加熱或いは加圧などにより定着されて
複写画像が形成される。Generally, in electrophotography, after applying a uniform electrostatic charge to a photoreceptor having a photosensitive layer made of a photoconductive material,
By performing image exposure, an electrostatic latent image is formed on the surface of the photoconductor, and the electrostatic latent image is developed with a developer to form a toner image. The obtained toner image is transferred to a transfer agent such as paper, and then fixed by heating or pressing to form a copied image.
現像剤としては、一般に、磁性体及び顔料を包含する
磁性トナーよりなる１成分現像剤と、磁性体を含有しな
い非磁性トナーと磁性を有するキャリアとを含有する２
成分現像剤とが知られている。The developer generally includes a one-component developer composed of a magnetic toner containing a magnetic substance and a pigment, and a non-magnetic toner containing no magnetic substance and a carrier having magnetism.
Component developers are known.
後者の２成分現像剤は、トナーとキャリアを機械的に
撹拌することによってトナーを摩擦帯電させるので、キ
ャリアの特性、撹拌の条件等を選定することにより、ト
ナーの帯電極性及び帯電量を相当程度自由に制御するこ
とが可能であり、又トナーに付与することのできる色彩
の選択範囲が広く、これらの点で前者の１成分現像剤よ
りも優れている。The latter two-component developer frictionally charges the toner by mechanically stirring the toner and the carrier. Therefore, by selecting the characteristics and stirring conditions of the carrier, the charge polarity and the charge amount of the toner are considerably increased. It can be freely controlled and has a wide selection range of colors that can be given to the toner. In these respects, it is superior to the former one-component developer.
２成分現像剤に用いられるキャリアとしては、キャリ
アの耐久性、摩擦帯電性が向上することから、磁性体粒
子を樹脂によりコーティングした樹脂コーディドアキャ
リアが好ましく用いられている。As a carrier used in the two-component developer, a resin-coded carrier in which magnetic particles are coated with a resin is preferably used because durability and triboelectricity of the carrier are improved.
キャリアの樹脂コーティング法としては、 （１） 流動層式スプレーコーティング コーティング用樹脂を溶剤に溶解した塗布液を、流動
層（気相）に浮遊する磁性体粒子の表面にスプレー塗布
し、次いで乾燥する方法、 （２） 浸漬コーティング コーティング用樹脂を溶剤に溶解した塗布液中に、磁
性体粒子を浸漬して被覆処理し、次いで乾燥する方法、
及び （３） 焼結式コーティング コーティング用樹脂を溶剤に溶解した塗布液を、磁性
体粒子の表面に塗布し、次いで樹脂を焼結する方法、 が挙げられる。The resin coating method of the carrier is as follows: (1) Fluidized bed type spray coating A coating solution obtained by dissolving a coating resin in a solvent is sprayed onto the surface of magnetic particles floating in a fluidized bed (gas phase), and then dried. (2) dip coating A method in which the magnetic particles are immersed in a coating solution obtained by dissolving a coating resin in a solvent, coated, and then dried.
And (3) Sintering-type coating A method in which a coating solution obtained by dissolving a coating resin in a solvent is applied to the surfaces of magnetic particles, and then the resin is sintered.
しかしながら、上記（１）の技術においては、樹脂溶
液を用いるため粒子相互の付着により凝塊率が高いな
り、その結果キャリアが大粒径化し所望の粒度分布のキ
ャリアの収率が大幅に減少し、又、乾燥工程が必要であ
り、キャリアの製造に相当長い時間を要し、生産性が低
い。これに対して、時間を短縮し生産性を高めるため、
塗布液のコーティング樹脂濃度を高くする、或いは
スプレーノズルの本数を多くする、ことが考えられる。
しかしながら、上記の場合には、塗布液の粘度が高く
なり、塗布液が磁性体粒子に付着した際滑らかに延展せ
ず、むらのあるコーティングとなり、その結果耐久性が
低下する。又、塗布液の粘性が高いため磁性体粒子同志
が一度接触すると容易に凝塊となり、キャリアの収率が
大幅に減少する。又上記の場合には、スプレーノズル
の本数にも限度があり、又一度にスプレーされる塗布液
量が多くなると、磁性体粒子の凝塊率が高くなり、上記
と同様の問題が起る。一方凝塊を防止するために、流
動層内に剪断力を付与するアジデータ機構を備える技術
もあるがアジデータにより凝塊を強制的に解砕すると表
面が粗く不均一となり、その結果キャリアの耐久性が低
下する。However, in the above-mentioned technique (1), since the resin solution is used, the agglomeration rate is increased due to the adhesion of the particles to each other. As a result, the carrier has a large particle size and the yield of the carrier having a desired particle size distribution is greatly reduced. In addition, a drying step is required, the production of the carrier requires a considerably long time, and the productivity is low. To save time and increase productivity,
It is conceivable to increase the coating resin concentration of the coating liquid or increase the number of spray nozzles.
However, in the above case, the viscosity of the coating solution increases, and when the coating solution adheres to the magnetic particles, it does not spread smoothly, resulting in an uneven coating, and as a result, the durability is reduced. Further, since the viscosity of the coating solution is high, once the magnetic particles come into contact with each other once, they easily form an agglomerate, and the carrier yield is greatly reduced. In the above case, the number of spray nozzles is also limited, and when the amount of the coating solution sprayed at a time increases, the agglomeration rate of the magnetic particles increases, causing the same problem as described above. On the other hand, in order to prevent agglomeration, there is a technology equipped with an agitator mechanism that applies a shearing force in the fluidized bed.However, if the agglomerate is forcibly crushed by the agitator, the surface becomes coarse and uneven, resulting in carrier The durability decreases.
上記（２）の浸漬コーティング技術においては、樹脂
溶液中に磁性体粒子が直接浸漬されるため、凝塊が著し
く生じ、結局キャリアの収率が大幅に低下する。In the dip coating technique of the above (2), since the magnetic particles are directly immersed in the resin solution, agglomeration is remarkably generated, and the yield of the carrier is greatly reduced after all.
上記（３）の技術においては、焼結に相当長い時間を
要し、又樹脂溶液を用いるため凝塊率も高く、生産性が
低いことが問題となる。又、焼結により樹脂を熱架橋さ
せるためにキャリアの被覆層が不均一となりやすく、キ
ャリアの耐久性もしくは耐用性の低下が問題である。In the above technique (3), sintering requires a considerably long time, and a resin solution is used, so that the agglomeration rate is high and the productivity is low. Further, since the resin is thermally cross-linked by sintering, the coating layer of the carrier tends to be non-uniform, and there is a problem in that the durability or durability of the carrier is reduced.
以上の問題を解決するために、特開昭63−235959号、
特開平２−87167号に記載される如き乾式コーティング
が提案されている。乾式コーティングによれば、磁性体
粒子の表面に特定粒径の樹脂微粒子を溶媒を使用せずに
混合撹拌によって付着させ、機械的衝撃力によって付着
樹脂微粒子塑性変形して延展するコーティングが行わ
れ、凝塊の発生が少なく、磁性体粒子の粒度分布に対応
したキャリアを高い収率で得ることができる。又、洗
浄、乾燥などの処理が不用となり、コーティングに要す
る時間を大幅に短縮することができる。更に、溶剤回収
装置、溶剤燃焼層などの処理設備が不用となるため、生
産コストを低減することができる。To solve the above problems, JP-A-63-235959,
A dry coating as described in JP-A-2-87167 has been proposed. According to the dry coating, a resin particle having a specific particle diameter is adhered to the surface of the magnetic particle by mixing and stirring without using a solvent, and the coating is performed so that the adhered resin particle is plastically deformed and spread by a mechanical impact, Agglomeration is less likely to occur, and a carrier corresponding to the particle size distribution of the magnetic particles can be obtained at a high yield. Further, processes such as washing and drying are not required, and the time required for coating can be greatly reduced. Furthermore, since processing equipment such as a solvent recovery device and a solvent combustion layer is not required, production costs can be reduced.
しかしながら、乾式コーティングは、まず芯材となる
磁性体粒子の表面に樹脂微粒子を均一に付着せしめ粉体
よりなる包接層を形成し、その後撹拌による機械的衝撃
力を付与することによって包接層中の樹脂微粒子を延展
し樹脂皮膜とした被覆層を形成固着せしめる。形成され
た被覆層の膜厚は、包接層の樹脂微粒子の付着量に依存
し、かつ樹脂微粒子の包接層は高々単粒子層程度であっ
て付着量が制限されるため充分な膜厚が得られない。そ
の結果、キャリアの摩擦帯電性が低く、磨耗による劣化
が早く耐用性に乏しい。被覆層の厚みを増すために、樹
脂微粒子の混合投入比を大きくして包接層の多粒子層化
を図ると、キャリアとの付着力の弱いもしくは付着の機
会に恵まれなかった樹脂微粒子が、コーティング槽内壁
に汚着する。又、樹脂微粒子が多量に投入されるため、
樹脂微粒子（一次粒子）同志が凝集し塊状化し、いわゆ
る二次粒子の塊粒が発生する。斯かる二次粒子は粒径が
大きく芯材表面の被覆層に同化することなくキャリア粒
子上に瘤状に残存し、或いは独立塊粒をしくキャリア粒
子中に混在し、キャリア粒子とトナー粒子の摩擦帯電性
を阻害し、引いては複写機内のトナー飛散や地かぶりの
原因となる。However, in the dry coating, first, the resin particles are uniformly adhered to the surface of the magnetic particles serving as the core material to form a cladding layer made of powder, and then the cladding layer is applied by applying a mechanical impact force by stirring. The resin fine particles therein are spread to form and fix a coating layer serving as a resin film. The thickness of the formed coating layer depends on the amount of the attached resin fine particles in the cladding layer, and the thickness of the cladding layer of the resin fine particles is at most about a single particle layer, and the amount of adhesion is limited. Can not be obtained. As a result, the triboelectric chargeability of the carrier is low, the deterioration due to abrasion is quick, and the durability is poor. In order to increase the thickness of the coating layer, the mixing ratio of the fine resin particles is increased to increase the number of layers of the cladding layer. Stains on the inner wall of the coating tank. In addition, because a large amount of resin fine particles are introduced,
Resin fine particles (primary particles) are aggregated and agglomerated, and so-called secondary particles are generated. Such secondary particles have a large particle size and remain on the carrier particles without being assimilated to the coating layer on the surface of the core material, or remain as independent agglomerates in the carrier particles. It inhibits triboelectrification and eventually causes toner scattering and background fogging in the copying machine.
本発明は、トナー飛散、地かぶりの発生がなく、又摩
擦帯電性が安定であり、耐久性が高く、かつ製造収率の
高い静電像現像用キャリア及びその製造方法を提供する
ことを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a carrier for developing an electrostatic image which is free from toner scattering and background fogging, has stable triboelectricity, has high durability, and has a high production yield, and a method for producing the same. And
前記本発明の目的は、磁性体粒子に樹脂微粒子を供給
し衝撃力を繰返し付与することによって樹脂微粒子を延
展して樹脂被覆する静電像現像用キャリアの乾式コーテ
ィング法において、被覆に用いる樹脂微粒子を少なくと
も２回に分けて間欠的に供給することを特徴とする静電
像現像用キャリアの製造方法、及び前記製造方法によっ
て作成された静電現像用キャリアによって達成される。It is an object of the present invention to provide a method for dry coating a carrier for electrostatic image development, in which resin fine particles are supplied to magnetic particles and repeatedly applied with an impact force to spread and coat the resin fine particles. Is supplied intermittently at least twice, and a method for producing a carrier for developing an electrostatic image, and a carrier for electrostatic development produced by the above-described method.
本発明の静電像現像用キャリアの乾式コーティング製
造方法によれば樹脂微粒子の二次凝集による塊粒の発生
がなく、安定した摩擦帯電性が得られるためトナー飛
散、地かぶりのない乾式コーティングキャリアが製造で
きる。ADVANTAGE OF THE INVENTION According to the dry coating manufacturing method of the carrier for developing an electrostatic image of the present invention, there is no generation of agglomerates due to secondary agglomeration of resin fine particles, and stable triboelectric charging is obtained, so that dry coating carrier without toner scattering and ground fogging is obtained. Can be manufactured.
又、樹脂被覆層を必要なだけ厚くすることができ、皮
膜を形成し、かつ固着に必要な衝撃力が均一に付与され
るため、表面が平滑で被着強度が強く、耐久性が高いキ
ャリアが製造できる。In addition, since the resin coating layer can be made as thick as necessary, the film is formed, and the impact force required for fixing is uniformly applied, so that the carrier has a smooth surface, high adhesion strength, and high durability. Can be manufactured.
すなわち、本発明においては芯材に更に次段階に進ん
だ芯材を含む先行素キャリア粒子への樹脂微粒子の粉体
包接層の形成及び該包接層の粒体樹脂微粒子から連続相
をなす樹脂皮膜及び変形、被覆層形成の一セットの過程
毎に過不足のない樹脂微粒子量を供給し、均質な被覆層
を形成した後に、再び樹脂微粒子の供給、粒体包接層形
成衝撃力による被覆層の形成が繰返される。従って帯電
極性の等しい樹脂微粒子同志の凝集よりも、大きさ及び
帯電状況の異る芯材を含む先行素キャリア粒子と樹脂微
粒子間の付着が支配的となり、被覆樹脂の間欠的多層化
が可能となる。That is, in the present invention, a powder inclusion layer of resin fine particles is formed on the preceding elementary carrier particles including the core material further advanced to the core material, and a continuous phase is formed from the granular resin fine particles of the inclusion layer. Resin film and deformation, supply a sufficient amount of fine resin particles in each set of the process of forming the coating layer, after forming a uniform coating layer, supply of fine resin particles again, the particle inclusion layer formation by impact force The formation of the coating layer is repeated. Therefore, the adhesion between the resin particles and the preceding elementary carrier particles including core materials having different sizes and charging conditions becomes more dominant than the aggregation of the resin particles having the same charge polarity, and intermittent multilayering of the coating resin is possible. Become.
又、上記状況による樹脂微粒子の多層化のため、芯材
を含む先行素キャリア粒子への樹脂微粒子の付着が多
く、コーティング槽内壁への樹脂微粒子付着及びコーテ
ィング槽外への樹脂微粒子漏出が少なくなり収率が向上
する。In addition, due to the above-mentioned situation, the resin fine particles are multi-layered, so that the resin fine particles adhere to the preceding elementary carrier particles including the core material, and the resin fine particles adhere to the inner wall of the coating tank and leak out of the resin tank to the outside. The yield is improved.
以下、本発明を具体的に説明する。 Hereinafter, the present invention will be described specifically.
本発明の静電像現像用キャリアは、重量平均粒径が10
〜200μｍの磁性体粒子をコーティング槽内に供給し、
重量平均粒径が１μｍ以下である樹脂微粒子を供給し、
混合撹拌して均一な混合状態とし、均等な包接層を形成
した粒子に繰返し衝撃力を与え被覆層の形成が一応進ん
だところで撹拌を中止した後、再度樹脂微粒子の供給と
混合撹拌を繰返し、磁性体粒子の表面に樹脂微粒子を供
給し、多回に亘り間欠的に多層被覆層を形成させる。更
に、衝撃力を繰返し付与することによって、樹脂微粒子
を磁性体粒子表面に安定、固着せしめてコーティドキャ
リアを得る。The electrostatic image developing carrier of the present invention has a weight average particle size of 10
~ 200μm magnetic particles are supplied into the coating tank,
Supplying resin fine particles having a weight average particle size of 1 μm or less;
After mixing and stirring to form a uniform mixing state, repeatedly apply impact force to the particles having an even inclusion layer, stop the stirring when the formation of the coating layer has progressed, and then repeat the supply and mixing and stirring of the resin fine particles again. Then, resin fine particles are supplied to the surfaces of the magnetic particles to form a multilayer coating layer intermittently many times. Further, by repeatedly applying an impact force, the resin fine particles are stably and firmly adhered to the surfaces of the magnetic particles to obtain a coated carrier.
一度に投入する樹脂微粒子の磁性体粒子に対する供給
重量比は、磁性体粒子100重量部（wtと表す）に対し、
樹脂微粒子0.1〜3wtが好ましく、供給混合を繰返した後
最終的に総量で0.5〜15wt供給することが好ましい。供
給、混合比が0.5wtより小さいと、充分な絶縁性が得ら
れず摩擦帯電性が低下する。又、供給、混合比が15wtよ
り大きい、磁性体粒子同志が樹脂微粒子により結着され
て凝塊を生ずる。The supply weight ratio of the resin fine particles fed at one time to the magnetic particles is 100 parts by weight (expressed as wt) of the magnetic particles.
Preferably, the resin fine particles are 0.1 to 3 wt., And after the supply and mixing are repeated, the final total amount is 0.5 to 15 wt. If the supply and mixing ratio is less than 0.5 wt%, sufficient insulating properties cannot be obtained, and the triboelectric charging property is reduced. In addition, the magnetic particles having a supply and mixing ratio of more than 15 wt are bound together by the resin fine particles to form an agglomerate.
本発明に係る磁性体粒子の樹脂微粒子によるコーティ
ング手段は、特に限定されるものではなく、通常の乾式
コーティング手段、例えば、回転羽根型コーティング装
置、容器回転型コーティング装置を使用すればよい。前
記回転羽根を有する回転羽根型コーティング装置の例の
概要を第１図に示す。The means for coating the magnetic particles according to the present invention with the resin fine particles is not particularly limited, and ordinary dry coating means, for example, a rotary blade type coating apparatus or a container rotary type coating apparatus may be used. An outline of an example of a rotary blade type coating apparatus having the rotary blade is shown in FIG.
図において１はチャンバ、２は４枚の撹拌羽根2a,2b,
2c及び2dを有する撹拌機、４は２の回転駆動モータであ
る。各羽根は回転の際に、空気、磁性体粒子及び樹脂微
粒子を粉流として跳ね上げる向きに回転軸に植付けられ
ている。この傾きによって、回転時各羽根からのa,b,c
及びｄの向き、大きさのベクトルによって、チャンバ中
に上向きの螺施施回粉流が生じる。しかしチャンバ周辺
で流速が速く、中心部では遅く、中心部と周辺部との粉
流の入替りが少いため、羽根2a〜2dによる粒子への衝撃
付与の機会が甚だ乏しくなる。これを防止するためチャ
ンバの上部を、前記上向き施回流を中心部に追返す搾み
壁12とすると同時に補助撹拌機３を設け、チャンバ内に
軸流を形成させている。これによって粒子への衝撃効果
が大幅に上る。５は素材の供給部、図示の例では投入方
式を採っており、51はホッパ、52は供給弁である。６は
コーティングキャリアの取出部、61は取出弁、62は取出
管である。７はチャンバ内の温度を調整するジャケット
であり、工程のフェースによって、蒸気、温水での加熱
或いは冷風、冷水による冷却が行われる。８は温度計で
あってアルメル−クロメル熱電対等が用いられる。回転
羽根の周速は、１〜20m/秒程度が好ましい、周速1m/秒
未満では、樹脂微粒子がチャンバ内部で均一に分散され
ず樹脂微粒子の二次粒子の凝塊が発生し、20m/秒を超え
る周速では、磁性体粒子の解砕、変形が発生する。In the figure, 1 is a chamber, 2 is four stirring blades 2a, 2b,
A stirrer having 2c and 2d, 4 is a rotary drive motor. Each blade is planted on the rotating shaft in a direction in which air, magnetic particles and resin fine particles are flipped up as a powder flow during rotation. Due to this inclination, a, b, c from each blade during rotation
And the direction and magnitude vectors of d create an upwardly threaded powder flow in the chamber. However, the flow velocity is high around the chamber, low at the center, and there is little change of the powder flow between the center and the periphery, so that the chance of applying impact to the particles by the blades 2a to 2d is greatly reduced. In order to prevent this, the upper part of the chamber is formed as a squeezing wall 12 for returning the upwardly directed flow to the center, and at the same time, the auxiliary stirrer 3 is provided to form an axial flow in the chamber. This greatly increases the impact effect on the particles. Reference numeral 5 denotes a material supply unit, which employs a charging method in the illustrated example, 51 denotes a hopper, and 52 denotes a supply valve. Reference numeral 6 denotes an outlet of the coating carrier, 61 denotes an outlet valve, and 62 denotes an outlet tube. Reference numeral 7 denotes a jacket for adjusting the temperature in the chamber. Heating with steam or hot water or cooling with cold air or cold water is performed depending on the face of the process. Reference numeral 8 denotes a thermometer, such as an alumel-chromel thermocouple. The peripheral speed of the rotating blade is preferably about 1 to 20 m / sec.If the peripheral speed is less than 1 m / sec, the resin fine particles are not uniformly dispersed inside the chamber, and the coagulation of the secondary particles of the resin fine particles occurs, and 20 m / sec. At a peripheral speed exceeding 2 seconds, the magnetic particles are crushed and deformed.
樹脂微粒子の投入と混合は、樹脂微粒子が軟化しない
温度で行なうことが好ましい。投入時にチャンバ内が、
樹脂微粒子が軟化するほどの高温であると、樹脂微粒子
の二次凝塊が発生する。The charging and mixing of the resin fine particles are preferably performed at a temperature at which the resin fine particles do not soften. At the time of loading,
If the temperature is high enough to soften the resin fine particles, secondary agglomeration of the resin fine particles is generated.
樹脂微粒子の包接層を延展して被覆層を固着する工程
では、常温で撹拌してもよく、樹脂微粒子をわずかに軟
化せしめる程度に加熱して撹拌してもよい。In the step of extending the cladding layer of the resin fine particles and fixing the coating layer, stirring may be performed at room temperature, or heating and stirring may be performed to such an extent that the resin fine particles are slightly softened.
磁性体粒子の重量平均粒径は、10〜200μｍの範囲が
好ましい。10μｍ未満の粒子は、感光体上に付着しやす
くなり、200μｍを越える粒子は、画質の鮮明度に悪影
響を及ぼす。The weight average particle diameter of the magnetic particles is preferably in the range of 10 to 200 μm. Particles smaller than 10 μm tend to adhere to the photoreceptor, and particles larger than 200 μm adversely affect the sharpness of image quality.
磁性体粒子の材料としては、磁場によってその方向に
強く磁化する物質、例えば鉄、フェライト、マグネタイ
トをはじめとする鉄、ニッケル、コバルト等の強磁性を
示す金属或いはこれらの合金又は化合物等を用いること
ができる。As the material of the magnetic particles, use a material which is strongly magnetized in the direction by a magnetic field, for example, a ferromagnetic metal such as iron, ferrite, magnetite, nickel, cobalt, etc., or an alloy or compound thereof. Can be.
本発明に使用される樹脂粒子は、磁性体粒子表面に多
層化して付着及び固着せしめるために、重量平均粒径が
１μｍ以下であることが好ましい。The resin particles used in the present invention preferably have a weight average particle size of 1 μm or less in order to form a multilayer on the surface of the magnetic particles to adhere and fix.
又、樹脂微粒子は通常の乾式コーティドキャリアに使
用される樹脂でよく、例えばスチレン系樹脂、アクリル
系樹脂、スチレン−アクリル系樹脂、ビニル系樹脂、エ
チレン系樹脂等の樹脂を用いることができる。ポリアミ
ド樹脂、ポリエステル樹脂、フッ素系樹脂、シリコーン
系樹脂等の樹脂を用いることができる。これらの樹脂は
組み合わせて用いてもよい。Further, the resin fine particles may be a resin used for a normal dry-coated carrier, and for example, a resin such as a styrene resin, an acrylic resin, a styrene-acryl resin, a vinyl resin, and an ethylene resin can be used. Resins such as polyamide resin, polyester resin, fluorine resin, and silicone resin can be used. These resins may be used in combination.
又空気との摩擦帯電列に基因する極性、大小によって
先行素キャリア粒子の帯電性に応じ、間欠コーティング
毎に樹脂を選んでもよい。Alternatively, a resin may be selected for each intermittent coating according to the polarity and magnitude of the frictional charging sequence with air, depending on the chargeability of the preceding carrier particles.
実施例１ 回転羽根型コーティング装置に平均粒径100μｍのフ
ェライト粒子100重量部（wt）、平均粒径0.1μｍのスチ
レン−アクリル系樹脂微粒子（重量組成比、スチレン：
メチルアクリレート＝3:7）1.5wt添加し、周速を10m/秒
の回転として15分間の第１次コーティングを行った。更
に前記と同様のスチレン−アクリル系樹脂微粒子1.5wt
を加え15分間第二次コーティングを行った。次にチャン
バ内を60℃に加温し10分間撹拌した。得られた樹脂コー
ティングキャリアを「キャリア１」とする。Example 1 100 parts by weight (wt) of ferrite particles having an average particle diameter of 100 μm and styrene-acrylic resin fine particles having an average particle diameter of 0.1 μm (weight composition ratio, styrene:
(Methyl acrylate = 3: 7) 1.5 wt. Was added, and primary coating was performed for 15 minutes at a rotation speed of 10 m / sec. Further, the same styrene-acrylic resin fine particles as above 1.5 wt%
Was added and a secondary coating was performed for 15 minutes. Next, the inside of the chamber was heated to 60 ° C. and stirred for 10 minutes. The obtained resin-coated carrier is referred to as “carrier 1”.
実施例２ 実施例１と同様なフェライト粒子に実施例１と同様の
樹脂微粒子を1wt添加し10分間コーティングを行った。
この操作を合計３回繰返し、合計で3.0wtの樹脂微粒子
を添加混合した後、チャンバ内を60℃に加温し10分間撹
拌した。得られた樹脂コーティドキャリアを「キャリア
２」とする。Example 2 1 wt. Of the same resin fine particles as in Example 1 was added to ferrite particles as in Example 1 and coating was performed for 10 minutes.
This operation was repeated three times in total, and after adding and mixing a total of 3.0 wt. Of resin fine particles, the inside of the chamber was heated to 60 ° C. and stirred for 10 minutes. The obtained resin-coated carrier is referred to as “carrier 2”.
比較例（１） 実施例１と同様なフェライト粒子に実施例１と同様の
樹脂微粒子を3wt添加した後、30分間混合した。Comparative Example (1) To the same ferrite particles as in Example 1, 3 wt. Of the same resin fine particles as in Example 1 were added, and then mixed for 30 minutes.
尚、ここでは１回の操作によりすべてを混合してい
る。Here, all are mixed by one operation.
次にチャンバ内を60℃に加温し10分間撹拌した。得ら
れた樹脂コーティドキャリアを「比較キャリア（１）」
とする。Next, the inside of the chamber was heated to 60 ° C. and stirred for 10 minutes. The obtained resin coated carrier is referred to as “Comparative carrier (1)”
And
（被覆状態の評価） 上記のキャリアを走査型電子顕微鏡で観察し、成膜状
態及び二次凝集の発生状況を判定した。(Evaluation of coating state) The above-mentioned carrier was observed with a scanning electron microscope, and a film forming state and a state of occurrence of secondary aggregation were determined.
（被覆率及び被覆効率の測定） 上記キャリア3gを50mlのメチルエチルケトンで樹脂被
膜を溶出し、溶出前後の質量差から被覆率を求めた。又
樹脂微粒子添加率に対する被覆率比を被覆効率とした。(Measurement of Coverage and Coverage Efficiency) The resin coating was eluted from 3 g of the above carrier with 50 ml of methyl ethyl ketone, and the coverage was determined from the difference in mass before and after elution. The ratio of the coating ratio to the resin fine particle addition ratio was defined as the coating efficiency.
（現像剤の調整） 上記の各キャリア965gとトナー35gを用いトナー濃度
が3.5wt％となる割合にてそれぞれ混合して現像剤を調
製した。(Adjustment of Developer) A developer was prepared by mixing 965 g of each carrier described above and 35 g of toner at a ratio where the toner concentration became 3.5 wt%.
（帯電量の測定） 上記の現像剤を公知のブローオフ法でトナーの帯電量
を測定した。(Measurement of Charge Amount) The charge amount of the toner of the above developer was measured by a known blow-off method.
（実写テスト） 上記の現像剤を電子写真複写機「UBix3042」（コニカ
社製）で、実写テストを行い以下の項目を評価した。(Actual Photo Test) The above-mentioned developer was subjected to an actual photo test using an electrophotographic copying machine “UBix3042” (manufactured by Konica Corporation) to evaluate the following items.
かぶり 「サクラデンシトメータ」（コニカ社製）を用いて原
稿濃度が0.0の白地部分の複写画像に対する相対濃度を
測定した。結果は0.05未満の場合を「○」、0.05以上の
場合を「×」とした。Fog Using a "Sakura Densitometer" (manufactured by Konica Corporation), the relative density of a white background portion having a document density of 0.0 with respect to the copied image was measured. As a result, the case where it was less than 0.05 was evaluated as “「 ”and the case where it was 0.05 or more was evaluated as“ × ”.
トナー飛散 複写機内を目視により観察し、トナー飛散がほとんど
認められない場合を「○」、トナー飛散が多く認められ
る場合を「×」とした。Toner Scattering The inside of the copying machine was visually observed, and "O" indicates that little toner scattering was observed, and "X" indicates that much toner scattering was observed.
耐久性 「サクラデンシトメーター」（コニカ社製）を用いて
原稿濃度が0.0の白地部分の複写画像に対する相対濃度
を測定し、ソリッド画像の濃度が1.0以下になる時点の
複写回数で評価した。Durability The relative density of a white background portion having a document density of 0.0 with respect to a copy image was measured using a "Sakura Densitometer" (manufactured by Konica Corporation), and the number of copies was evaluated when the density of a solid image became 1.0 or less.
以上の評価結果を表１に示す。 Table 1 shows the evaluation results.
〔発明の効果〕 表１に明かなように、本発明の被覆用樹脂微粒子を複
数回に分けて間欠的に乾式コーティングを行ったコーテ
ィングキャリアは、被覆状態、被覆効率が高く、かつ帯
電特性、耐用性等比較例に比べ遥かに良好である。 [Effects of the Invention] As is clear from Table 1, the coating carrier obtained by intermittently performing dry coating by dividing the coating resin fine particles of the present invention into a plurality of times has a high coating state, high coating efficiency, and high charging characteristics. It is much better than the comparative example such as durability.
第１図は本発明に適用可能な回転羽根型コーティング装
置の概要図である。 １……チャンバ、 ２……撹拌機、 2a,2b,2c及び2d……回転羽根 ３……補助撹拌機 ５……供給部 ６……取出部 ７……ジャケットFIG. 1 is a schematic view of a rotary blade type coating apparatus applicable to the present invention. DESCRIPTION OF SYMBOLS 1 ... Chamber, 2 ... Stirrer, 2a, 2b, 2c and 2d ... Rotating blade 3 ... Auxiliary stirrer 5 ... Supply part 6 ... Extraction part 7 ... Jacket
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−235959（ＪＰ，Ａ) 特開 昭63−228174（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) G03G 9/113────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-235959 (JP, A) JP-A-63-228174 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) G03G 9/113
Claims (2)
繰返し付与することによって、樹脂微粒子を延展して、
樹脂被覆する静電像現像用キャリアの乾式コーティング
法において、被覆に用いる樹脂微粒子を少なくとも２回
に分けて間欠的に供給することを特徴とする静電像現像
用キャリアの製造方法。The present invention is characterized in that resin fine particles are extended to magnetic material particles by supplying resin fine particles and repeatedly applying an impact force.
A method for producing an electrostatic image developing carrier, comprising: intermittently supplying at least two times fine resin particles to be used for coating in a dry coating method of a resin-coated electrostatic image developing carrier.
繰返し付与することによって、樹脂微粒子を延展して、
樹脂被覆する静電像現像用キャリアの乾式コーティング
法において、被覆に用いる樹脂微粒子を少なくとも２回
に分けて間欠的に供給し樹脂被覆されたことを特徴とす
る静電像現像用キャリア。2. The method according to claim 1, wherein the fine resin particles are supplied to the magnetic particles and the impact force is repeatedly applied to extend the fine resin particles.
A carrier for electrostatic image development characterized in that, in a dry coating method of a carrier for electrostatic image development to be coated with a resin, resin fine particles used for coating are intermittently supplied at least twice and coated with a resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1079312A JP2811079B2 (en) | 1989-03-29 | 1989-03-29 | Electrostatic image developing carrier and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1079312A JP2811079B2 (en) | 1989-03-29 | 1989-03-29 | Electrostatic image developing carrier and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02256074A JPH02256074A (en) | 1990-10-16 |
| JP2811079B2 true JP2811079B2 (en) | 1998-10-15 |
Family
ID=13686341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1079312A Expired - Lifetime JP2811079B2 (en) | 1989-03-29 | 1989-03-29 | Electrostatic image developing carrier and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2811079B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8323726B2 (en) | 2009-06-19 | 2012-12-04 | Canon Kabushiki Kaisha | Production method of magnetic carrier and magnetic carrier produced therewith |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000098655A (en) * | 1998-09-28 | 2000-04-07 | Kyocera Corp | Metal toner for formation of conductive pattern, production of metal toner for formation of conductive pattern and use method of metal toner for formation of conductive pattern |
| JP6012328B2 (en) | 2012-08-01 | 2016-10-25 | キヤノン株式会社 | Manufacturing method of magnetic carrier |
-
1989
- 1989-03-29 JP JP1079312A patent/JP2811079B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8323726B2 (en) | 2009-06-19 | 2012-12-04 | Canon Kabushiki Kaisha | Production method of magnetic carrier and magnetic carrier produced therewith |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02256074A (en) | 1990-10-16 |
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